performance
Performance profiling and SwiftUI debugging skills — Instruments guidance, hangs, memory issues, slow launches, energy drain, unnecessary re-renders, and view identity problems. Use when an app is slow, janky, or resource-hungry.
- Installs
- 182
- Last 24h
- —
- Trending rank
- —
- Security
- Not audited
Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/rshankras/claude-code-apple-skills --skill performance- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads performance automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
Performance Skills
Diagnose and fix performance problems, from system-level profiling to SwiftUI render behavior.
When This Skill Activates
Use this skill when the user:
- Reports the app is slow, janky, or hanging
- Wants to profile with Instruments (Time Profiler, Allocations, Hangs)
- Is investigating memory issues, slow launches, or energy drain
- Sees SwiftUI views re-rendering too often or slow
bodyevaluations - Asks about view identity problems or
_printChanges()
Available Skills
Paths are relative to THIS file's directory — skills run with cwd set to the user's project, so resolve each path from this SKILL.md's own location.
| Skill | Read | Covers |
|---|---|---|
| profiling | profiling/SKILL.md | Instruments workflows; hangs, memory, slow launch, energy diagnosis |
| swiftui-debugging | swiftui-debugging/SKILL.md | Unnecessary re-renders, view identity, slow body evaluations |
How to Route
- Match the request to a row above — system-level symptoms → profiling; SwiftUI render symptoms → swiftui-debugging.
- Read that SKILL.md (relative to this file) plus any reference files it lists.
- Apply the guidance to the user's code.
FAQ
What does the performance skill do?
Performance profiling and SwiftUI debugging skills — Instruments guidance, hangs, memory issues, slow launches, energy drain, unnecessary re-renders, and view identity problems. Use when an app is slow, janky, or resource-hungry.
How do I install performance?
Run npx skills add https://github.com/rshankras/claude-code-apple-skills --skill performance in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/performance/ (personal) or .claude/skills/performance/ (project).
Which AI agents can use performance?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is performance safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains performance?
It is published by rshankras in rshankras/claude-code-apple-skills. It has 182 recorded installs.
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